Improve GCC compatibility by adding stubs for some builtins.
These are important when parsing the GCC provided intrinsics for SSE & friends. The new unit test ensures that it works as intended. Some caveats: - This won't work properly on non-ia32 platforms. - Potentially we need similar things for compatibility with the Intel compiler. - There are still some errors generated in xmmintrin.h b/c some builtins are defined by both, GCC and Clang, but the latter are stricter. Thus we get errors reported when the GCC intrinsics try to pass const pointers as non-const parameters etc. BUG: 354311
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0a6a58f1
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